33
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Draining
When performing standard maintenance procedures
if factory mounted water isolation valves are provided.
maintenance procedures.
Back Washing
It may become evident from the recorded weekly log
data that the performance of the chiller is gradually
degrading. This could be due to a buildup of debris or sludge
exchangers. This debris can be removed by a back washing
process which involves the introduction of a forced, violent
of this method depend on the back wash pumping system
Figure 25 – City Water Cleaning Arrangement on page 33).
The back washing procedure is accomplished by isolating
each individual heat exchanger and introducing the city
in an opposite direction from the normal heat exchanger
Warning: Water valves must
be re-opened after ushing is complete.
Chemical Clean In Place Washing Without Water
Isolation Valves
Chemical Clean in place washing will typically provide
the best debris removal, even from severely clogged
heat exchangers. In order to clean the heat exchangers
for modules WITHOUT water isolation valves, it will be
necessary to mechanically and electrically isolate each
module separately from the bank of modules. The rest of
the chiller modules will need to be disabled during this
header will be interrupted. The cleaning tank, pump and
pump strainer should be arranged in the manner shown in
the normal operational direction. Connection points are
The cleaning solution used can be either a detergent or hot
water to remove particles and simple cleaning. If correct
water treatment has been implemented, this should provide
adequate cleaning for most situations. The solution can
be pumped through the heat exchangers and allowed to
“soak” for a time and then pumped again. Upon successful
cleaning of a module, proceed to isolate a second module
separately from the bank to repeat the cleaning process.
Chemical Clean In Place Washing With Water
Isolation Valves
Chemical Clean in place washing will typically provide the
best debris removal, even from severely clogged heat
exchangers. It is only necessary to mechanically
and electrically isolate one module at a time. The rest
of the chiller modules can continue to operate to satisfy
the required cooling load. The cleaning tank, pump and
pump strainer should be arranged in the manner shown in
Figure 26 - In Place Cleaning Arrangement on page 33.
to the normal operational direction. Connection points are
The cleaning solution used can be either a detergent or hot
water to remove particles and simple cleaning. If correct
water treatment has been implemented, this should provide
adequate cleaning for most situations. The solution can be
pumped through the heat exchangers and allowed to soak
for a time and then pumped again.
If it is required to remove carbonates, then an acidic wash
should be used. A 2% solution of phosphoric or sulfamic
acids in pure water are generally acceptable. These acid
solutions should only be allowed to circulate within the heat
exchanger for 10 to 15 minutes, followed by a thorough pure
Hydrochloric or sulfuric
acids must not be used. In any case, consult the chemical
supplier to establish the correct formulation and handling
process. The materials exposed to the wash are stated on
page 20 – Water Treatment.
Once the washing is complete, the solution should be
through the chiller. To achieve a reasonable level of dilution,
it may be required to change the water several times. After
cleaning, the water quality and water treatment should
Heat Exchangers
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